Публикуется в электронном виде на правах учебного курсового проекта.

The irregular radio local area networks (RLAN)

For a LAN-radiochannel design (a RLAN) can be used a long waves (a LW is in 100 kHz...150 kHz), a very low friquency (a VLF is in 12 kHz...100 kHz) and a medium waves (a MW is in 150 kHz...2 MHz) that not used for a civil broadcasting radiostations. A price of such design is very low. The main characteristic of this units is a low transmitter power that equal to value of a natural noise level. This can to mask a units. Of course, an antennas for that transmitters has very big sizes from a hundreds meters to some kilometers then other objects can be used as a longest antennas: this is an citie's iron waterpipes and an electric powerlines without direct contacts with this and with a capacity or an inductive connection. A magnet antenna can be used for a RLAN design with some computers in one building with a distances and has not more than 50 meters. The power of a transmitter in that a RLAN can not be more than 0.5...1.5 W. A medium friquency amplifier of a reciever must use value about 7...10 kHz and user can work through a telephone's modem with this.



This is a simple transmitter scheme for a VLF (Very Low Friquency), a LW, a MW and a SW ranges. This transmitter power is an enough for a RLAN-connections to distances about 200 meters. For work need to place a transmitter's antenna near a waterpipes or an electric powerline.

Low power radiowave has running in a metal surfaces without a decreasing to the big distances (about 2...3 km)

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